COMNET III

Chapter 11. Global Transport and Answer Commands
11.4 Window Stats Report
GLOBAL TRANSPORT + ANSWER COMMANDS: WINDOW STATS
REPLICATION 1 FROM 0.0 TO 300.0 SECONDS
ORIGIN / COMMAND NAME: WINDOW NO. OF CONG PKT CREATION INTERVAL (MS)
DESTINATION LIST AVG MAX RESETS AVOID AVG MAX STD DEV
______________________ ______ ___ ______ ______ _______ _______ _______
Application Workstation / src Application Request:
cmd Global DB Request:
Application Server 2.00 2 0 0 9 15 4
Application Server / src Application Source:
cmd Global Request Response:
ECHO 2.00 2 0 0 293 1143 490
The Window Stats Report presents the statistics on the TCP/IP congestion window that varies
as the connection starts up and when congestion is detected. It also presents the statistics
for the interval between packets being created.
Window Size—Average, Maximum
The average and maximum size of the TCP/IP congestion window, in
packets.
Number Of Congestion Resets
Congestion Avoidances
The number of times that the TCP/IP "congestion" window (dynamic
window size) is reset to 1 packet. Thus, congestion window size is reset.
After a reset, the window size starts to grow more slowly (linearly) than
the initial "slow start" window growth. This algorithm switch is counted
as "Congestion Avoidance" and gives a measure of how often the network
is recovering from congestion. If Congestion Avoidance is nearly the
same as the Number of Congestion Resets, then congestion may be
spurious or short-lived. If there are lots of Congestion Resets and few
Congestion Avoidances, then either the network is very congested or the
message sizes are not very large.
Packet Creation Interval (MS)—Average, Maximum, Standard Deviation
The average, maximum and standard deviation of the observed time
interval between the creation of packets.
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